Finish of many a URL

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COM.

Last seen on: Wall Street Journal Crossword – October 28 2019 – Seeing Dings

Random information on the term “COM”:

COM (Communication port) is the original, yet still common, name of the serial port interface on IBM PC-compatible computers. It can refer not only to physical ports, but also to emulated ports, such as ports created by Bluetooth or USB-to-serial adapters.

Most PC-compatible computers in the 1980s and 1990s had one or two COM ports. As of 2007, most computers shipped with one or no physical COM ports. As of 2014, consumer-grade PC-compatible computers don’t include any COM ports, though some of them do still include a COM header on the motherboard.

After the RS-232 COM port was removed from most consumer-grade computers in the 2000s, an external USB-to-UART serial adapter cable was used to compensate for the loss. A major supplier of these chips is FTDI.

The COM ports are interfaced by an integrated circuit such as 16550 UART. This IC has seven internal 8-bit registers which hold information and configuration data about which data is to be sent or was received, the baud rate, interrupt configuration and more. In the case of COM1, these registers can be accessed by writing to or reading from the I/O addresses 0x3F8 to 0x3FF.

COM on Wikipedia